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Polymer electrolyte for a direct oxidation fuel cell, method of preparing the same, and direct oxidation fuel cell comprising the same

a fuel cell and polymer electrolyte technology, applied in the direction of fuel cell details, final product manufacturing, chemical/physical processes, etc., can solve the problems of unreacted fuel lost during operation, change in the surface dimensions of the membrane, and the inability to react with unreacted fuel, etc., to achieve good electrochemical characteristics, reduce cross-over of hydrocarbon fuel, and improve the effect of electrochemical properties

Inactive Publication Date: 2006-11-09
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] A first embodiment of the present invention provides a polymer electrolyte membrane for direct oxidation fuel cells which has good electrochemical characteristics, thermal stability, dimensional stability and mechanical characteristics, and reduced cross-over of hydrocarbon fuel.

Problems solved by technology

The polymer electrolyte membrane fuel cell has the advantage of having high energy density, but also has the problems of requiring careful handling of the hydrogen gas, or requiring accessory facilities such as a fuel reforming processor for reforming fuel gas such as methane, methanol, or natural gas to produce the hydrogen required.
A thinner membrane provides lower membrane resistance, but worse mechanical properties whereby unreacted fuel gas and liquid tend to pass through the polymer membrane resulting in lost unreacted fuel during operation and lower performance of the cell.
A change in the surface dimensions of the membrane induces physical deterioration of the interface between the catalyst particles and electrolyte membrane when the fuel cell is operated for long durations.

Method used

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  • Polymer electrolyte for a direct oxidation fuel cell, method of preparing the same, and direct oxidation fuel cell comprising the same
  • Polymer electrolyte for a direct oxidation fuel cell, method of preparing the same, and direct oxidation fuel cell comprising the same
  • Polymer electrolyte for a direct oxidation fuel cell, method of preparing the same, and direct oxidation fuel cell comprising the same

Examples

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example 1

[0108] Solid NAFION® resin was obtained by evaporating commercially available 5 wt % NAFION® / H2O / 2-propanol (Solution Technology Inc., EW=1,100) solution under a vacuum at room temperature while agitating. Cation exchange resin liquid (5 wt % NAFION® / DMAc) was prepared by adding 5 parts by weight of the obtained solid NAFION® resin to 100 parts by weight of dimethylacetamide (Aldrich, DMAc) and agitating mechanically at 100° C. for 24 hours.

[0109] Montmorillonite treated with an organic modifying agent (Southern Clay Products, Cloisite 10A, with an aspect ratio of 1 / 500 at a state where the organic modifying agents are fully intercalated and with a long-axis length of about 0.3 μm) was added into the cation exchange resin liquid in an amount of 2 parts by weight based on 100 parts by weight of the cation exchange resin. Then, the mixture was mixed by a magnet agitator at 100° C. for 24 hours while applying ultrasound to obtain a cation exchange resin liquid mixture (NAFION®) / MMT / DM...

example 2

[0115] A polymer electrolyte membrane was prepared according to the same method as in Example 1, except that 10 parts by weight of montmorillonite was used based on 100 parts by weight of a cation exchange resin. The weight ratio of cation exchange resin, polymer supporter and montmorillonite in the prepared polymer electrolyte membrane was about 100:13.6:2, which is similar to that of Example 1.

example 3

[0116] A polymer electrolyte membrane was prepared according to the same method as in Example 1, except that kaolinite was mixed with the cation exchange resin liquid obtained in Example 1 to prepare the cation exchange resin liquid mixture. The weight ratio of cation exchange resin, polymer supporter and kaolinite in the prepared polymer electrolyte membrane was about 100:13.6:2.

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Abstract

A polymer electrolyte membrane for a direct oxidation fuel cell includes a porous polymer supporter having a plurality of pores, and a hydrocarbon fuel diffusion barrier layer which is formed on the polymer supporter and contains an inorganic additive dispersed in a cation exchange resin.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2004-0082155 filed with the Korean Intellectual Property Office on Oct. 14, 2004, and Korean Patent Application No. 10-2005-0055834 filed with the Korean Intellectual Property Office on Jun. 27, 2005, the entire contents of which are incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to a polymer electrolyte membrane for a direct oxidation fuel cell, a method of preparing the same and a direct oxidation fuel cell system comprising the same. More particularly, the present invention relates to a direct oxidation fuel cell system having a high power density using a thin membrane to prevent permeability of a hydrocarbon fuel. BACKGROUND OF THE INVENTION [0003] A fuel cell is a power generation system for producing electrical energy through an electrochemical redox reaction of an oxidant and hydrogen in a hydrocar...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M8/10C08J5/22
CPCH01M8/0239H01M8/0291H01M8/1023Y02E60/523H01M8/1051H01M8/106H01M8/1039H01M8/0289Y02E60/50Y02P70/50
Inventor SONG, MIN-KYUKIM, YOU-MEEKWEON, HO-JINRHEE, HEE-WOO
Owner SAMSUNG SDI CO LTD
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